<?php  

class resizeimage  

{  
    var $type;  
    var $width;  //实际宽度  
    var $height;    //实际高度 
    var $resize_width;    //改变后的宽度 
    var $resize_height;    //改变后的高度
    var $cut;     //是否裁图 
    var $srcimg;    //源图象
    var $dstimg;      //目标图象地址
    var $im;  //临时创建的图象
    function resizeimage($img, $wid, $hei,$c,$dstpath)  
    {  
        $this->srcimg = $img;  
        $this->resize_width = $wid;  
        $this->resize_height = $hei;  
        $this->cut = $c;   //图片的类型  

$this->type = strtolower(substr(strrchr($this->srcimg,"."),1));  //初始化图象  

        $this->initi_img(); //目标图象地址  

        $this -> dst_img($dstpath);   //--  

        $this->width = imagesx($this->im);  

        $this->height = imagesy($this->im);  //生成图象  

        $this->newimg();  

        ImageDestroy ($this->im);  
    }  
	
    function newimg()  
    {  
        //改变后的图象的比例  
        $resize_ratio = ($this->resize_width)/($this->resize_height);  
        //实际图象的比例  
        $ratio = ($this->width)/($this->height);  
        if(($this->cut)=="1")  
        //裁图  
        {  
            if($ratio>=$resize_ratio)  
            //高度优先  
            {  
                $newimg = imagecreatetruecolor($this->resize_width,$this->resize_height);  
                imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width,$this->resize_height, (($this->height)*$resize_ratio), $this->height);  
                ImageJpeg ($newimg,$this->dstimg);  

            }  
            if($ratio<$resize_ratio)  
            //宽度优先  
            {  
                $newimg = imagecreatetruecolor($this->resize_width,$this->resize_height);  
                imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, $this->resize_height, $this->width, (($this->width)/$resize_ratio));  
                ImageJpeg ($newimg,$this->dstimg);  
            }  
        }  

        else 
        //不裁图  
        {  
            if($ratio>=$resize_ratio)  
            {  
                $newimg = imagecreatetruecolor($this->resize_width,($this->resize_width)/$ratio);  
                imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, ($this->resize_width)/$ratio, $this->width, $this->height);  
                ImageJpeg ($newimg,$this->dstimg);  
            }  
            if($ratio<$resize_ratio)  
            {  
                $newimg = imagecreatetruecolor(($this->resize_height)*$ratio,$this->resize_height);  
                imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, ($this->resize_height)*$ratio, $this->resize_height, $this->width, $this->height);  
                ImageJpeg ($newimg,$this->dstimg);  
            }  
        }  
    }  
    //初始化图象  
    function initi_img()  
    {  
        if($this->type=="jpg")  
        {  
            $this->im = imagecreatefromjpeg($this->srcimg);  
        }  
        if($this->type=="gif")  
        {  
            $this->im = imagecreatefromgif($this->srcimg);  
        }  
        if($this->type=="png")  
        {  
            $this->im = imagecreatefrompng($this->srcimg);  
        }  
    }  
    //图象目标地址  
    function dst_img($dstpath)  
    {  
        $full_length  = strlen($this->srcimg);  
        $type_length  = strlen($this->type);  
        $name_length  = $full_length-$type_length;  
        $name         = substr($this->srcimg,0,$name_length-1);  
        $this->dstimg = $dstpath;  

//echo $this->dstimg;  

    }  
}  
$resizeimage = new resizeimage("10263.png", "160", "85", "0","10263_small.png");  

?>  